/*
 * Copyright (c) 2023-2025 elsfs Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.elsfs.cloud.common.mybatis.ext.sql.support.order;

import java.util.List;
import java.util.stream.Collectors;
import lombok.RequiredArgsConstructor;
import org.apache.commons.compress.utils.Lists;

/** 多字段排序 */
@RequiredArgsConstructor
public class CompositeOrderItem implements OrderItem {

  /** 排序条件项列表 */
  private final List<OrderItem> orderItems;

  public CompositeOrderItem() {
    this.orderItems = Lists.newArrayList();
  }

  /**
   * 添加排序项
   *
   * @param orderItem 排序项
   */
  public void addOrderItem(OrderItem orderItem) {
    this.orderItems.add(orderItem);
  }

  /**
   * 构建SQL片段
   *
   * @return SQL片段
   */
  @Override
  public String buildSqlFragment() {
    return String.format(
        "ORDER BY %s",
        this.orderItems.stream()
            .map(OrderItem::buildSqlFragment)
            .collect(Collectors.joining(", ")));
  }
}
